\begin{tikzpicture}[scale=0.5]
    \tkzDefPoints{0/0/A, 1/0/c}
    \tkzDefPoint(30:7.4){B}
    \tkzDefMidPoint(A,B)  \tkzGetPoint{D}
    \tkzDefLine[altitude](A,B,c)  \tkzGetPoint{C}
    \tkzDefLine[altitude](A,D,c)  \tkzGetPoint{E}
    \tkzDrawPolygon(A,B,C)
    \tkzDrawSegments(C,D  D,E)
    \tkzLabelPoints[below](A,C,E)
    \tkzLabelPoints[above](B,D)
\end{tikzpicture}

